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| 1 | +import { type RemoteAddr } from "../core/client.ts"; |
| 2 | +import { type AnyPlugins, createPlugin, type Plugin } from "../core/plugins.ts"; |
| 3 | +import type { Conn } from "../runtime/types.ts"; |
| 4 | + |
| 5 | +export type WebSocketFeatures = Record<never, never>; |
| 6 | + |
| 7 | +const SUBPROTOCOLS = ["binary.ircv3.net", "text.ircv3.net"]; |
| 8 | + |
| 9 | +function buildWebSocketUrl( |
| 10 | + hostname: string, |
| 11 | + port: number, |
| 12 | + tls: boolean, |
| 13 | + path?: string, |
| 14 | +): string { |
| 15 | + const protocol = tls ? "wss" : "ws"; |
| 16 | + const base = `${protocol}://${hostname}:${port}`; |
| 17 | + const url = new URL(path ?? "/", base); |
| 18 | + return url.href; |
| 19 | +} |
| 20 | + |
| 21 | +export class WebSocketConn implements Conn { |
| 22 | + private chunks: Uint8Array[] = []; |
| 23 | + private pendingRead: { |
| 24 | + resolve: (n: number | null) => void; |
| 25 | + reject: (e: Error) => void; |
| 26 | + buffer: Uint8Array; |
| 27 | + } | null = null; |
| 28 | + private ended = false; |
| 29 | + private error: Error | null = null; |
| 30 | + private encoder = new TextEncoder(); |
| 31 | + |
| 32 | + constructor(private ws: WebSocket) { |
| 33 | + ws.onmessage = (event) => { |
| 34 | + let chunk: Uint8Array; |
| 35 | + |
| 36 | + if (event.data instanceof ArrayBuffer) { |
| 37 | + chunk = new Uint8Array(event.data); |
| 38 | + } else if (typeof event.data === "string") { |
| 39 | + chunk = this.encoder.encode(event.data); |
| 40 | + } else if (event.data instanceof Blob) { |
| 41 | + event.data.arrayBuffer().then((buf) => { |
| 42 | + this.push(new Uint8Array(buf)); |
| 43 | + }); |
| 44 | + return; |
| 45 | + } else { |
| 46 | + this.fail(new Error("Unexpected WebSocket message type")); |
| 47 | + return; |
| 48 | + } |
| 49 | + |
| 50 | + this.push(chunk); |
| 51 | + }; |
| 52 | + |
| 53 | + ws.onclose = () => { |
| 54 | + this.ended = true; |
| 55 | + |
| 56 | + if (this.pendingRead) { |
| 57 | + const req = this.pendingRead; |
| 58 | + this.pendingRead = null; |
| 59 | + req.resolve(null); |
| 60 | + } |
| 61 | + }; |
| 62 | + |
| 63 | + ws.onerror = () => { |
| 64 | + this.fail(new Error("WebSocket error")); |
| 65 | + }; |
| 66 | + } |
| 67 | + |
| 68 | + private push(chunk: Uint8Array): void { |
| 69 | + if (this.pendingRead) { |
| 70 | + const req = this.pendingRead; |
| 71 | + this.pendingRead = null; |
| 72 | + const len = Math.min(chunk.length, req.buffer.length); |
| 73 | + req.buffer.set(chunk.subarray(0, len)); |
| 74 | + if (chunk.length > req.buffer.length) { |
| 75 | + this.chunks.push(chunk.subarray(req.buffer.length)); |
| 76 | + } |
| 77 | + req.resolve(len); |
| 78 | + } else { |
| 79 | + this.chunks.push(chunk); |
| 80 | + } |
| 81 | + } |
| 82 | + |
| 83 | + private fail(error: Error): void { |
| 84 | + this.error = error; |
| 85 | + this.ended = true; |
| 86 | + |
| 87 | + if (this.pendingRead) { |
| 88 | + const req = this.pendingRead; |
| 89 | + this.pendingRead = null; |
| 90 | + req.reject(error); |
| 91 | + } |
| 92 | + } |
| 93 | + |
| 94 | + read(buffer: Uint8Array): Promise<number | null> { |
| 95 | + if (this.chunks.length > 0) { |
| 96 | + const chunk = this.chunks.shift()!; |
| 97 | + const len = Math.min(chunk.length, buffer.length); |
| 98 | + buffer.set(chunk.subarray(0, len)); |
| 99 | + if (chunk.length > buffer.length) { |
| 100 | + this.chunks.unshift(chunk.subarray(buffer.length)); |
| 101 | + } |
| 102 | + return Promise.resolve(len); |
| 103 | + } |
| 104 | + if (this.error) return Promise.reject(this.error); |
| 105 | + if (this.ended) return Promise.resolve(null); |
| 106 | + |
| 107 | + return new Promise((resolve, reject) => { |
| 108 | + this.pendingRead = { resolve, reject, buffer }; |
| 109 | + }); |
| 110 | + } |
| 111 | + |
| 112 | + write(bytes: Uint8Array): Promise<number> { |
| 113 | + this.ws.send(bytes); |
| 114 | + return Promise.resolve(bytes.length); |
| 115 | + } |
| 116 | + |
| 117 | + close(): void { |
| 118 | + this.ws.close(); |
| 119 | + } |
| 120 | +} |
| 121 | + |
| 122 | +function connectWebSocket( |
| 123 | + hostname: string, |
| 124 | + remoteAddr: RemoteAddr, |
| 125 | +): Promise<Conn> { |
| 126 | + const url = buildWebSocketUrl( |
| 127 | + hostname, |
| 128 | + remoteAddr.port, |
| 129 | + !!remoteAddr.tls, |
| 130 | + remoteAddr.path, |
| 131 | + ); |
| 132 | + const ws = new WebSocket(url, SUBPROTOCOLS); |
| 133 | + ws.binaryType = "arraybuffer"; |
| 134 | + |
| 135 | + return new Promise<Conn>((resolve, reject) => { |
| 136 | + let settled = false; |
| 137 | + ws.onopen = () => { |
| 138 | + settled = true; |
| 139 | + resolve(new WebSocketConn(ws)); |
| 140 | + }; |
| 141 | + ws.onerror = () => { |
| 142 | + if (!settled) { |
| 143 | + settled = true; |
| 144 | + reject(new Error(`WebSocket connection to ${url} failed`)); |
| 145 | + } |
| 146 | + }; |
| 147 | + ws.onclose = () => { |
| 148 | + if (!settled) { |
| 149 | + settled = true; |
| 150 | + reject(new Error(`WebSocket connection to ${url} closed before open`)); |
| 151 | + } |
| 152 | + }; |
| 153 | + }); |
| 154 | +} |
| 155 | + |
| 156 | +const plugin: Plugin<WebSocketFeatures, AnyPlugins> = createPlugin( |
| 157 | + "websocket", |
| 158 | + [], |
| 159 | +)((client, _options) => { |
| 160 | + client.hooks.beforeCall("connect", (_hostname, options = {}) => { |
| 161 | + if (options.websocket && options.port === undefined) { |
| 162 | + throw new Error("WebSocket requires an explicit port"); |
| 163 | + } |
| 164 | + }); |
| 165 | + |
| 166 | + client.hooks.hookCall( |
| 167 | + "createConn", |
| 168 | + (originalCreateConn, hostname, remoteAddr) => { |
| 169 | + if (!remoteAddr.websocket) { |
| 170 | + return originalCreateConn(hostname, remoteAddr); |
| 171 | + } |
| 172 | + |
| 173 | + if (typeof globalThis.WebSocket === "undefined") { |
| 174 | + throw new Error( |
| 175 | + "WebSocket transport requires a runtime with WebSocket global " + |
| 176 | + "(Node 22+, Deno, Bun, or browser)", |
| 177 | + ); |
| 178 | + } |
| 179 | + |
| 180 | + return connectWebSocket(hostname, remoteAddr); |
| 181 | + }, |
| 182 | + ); |
| 183 | +}); |
| 184 | + |
| 185 | +export default plugin; |
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